Check the extension of the created workbook. If it's probably not xlsx and your current Excel version expects xlsx.

>Hi,
>
>Whenever I export a file from VFP 9 application (either using EXPORT TO or Createobject("Excel.Application")) and then open the resulting Excel file, I get the message (as shown in the attached image). Then, when I click on Yes (that is to open it anyway), I don't seem to see any problems with the Excel file content?
>Why then MS Excel shows this message?
>TIA